Application Developer
60+ Application Developer Interview Questions and Answers for Freshers
Q1. Puzzle: – Two persons X and Y are sitting side by side with a coin in each’s hand. The game is to simultaneously flip the coin till anyone wins. Player X will win if he gets a consecutive HEAD, TAIL however Y w...
read moreThe game is not fair.
Player X has a higher chance of winning as they only need to get a consecutive HEAD, TAIL.
Player Y needs to get a consecutive HEAD, HEAD which is less likely to occur.
The probability of Player X winning is higher than Player Y winning.
Q2. In a bag you have 20 black balls and 16 red balls.When you take out 2 black balls you take another white ball.If you take 2 white balls then you take out 1 black ball and if balls are of different color you tak...
read moreThe last ball that will be left is black.
When you take out 2 black balls, you take another white ball.
If you take 2 white balls, you take out 1 black ball.
If balls are of different color, you take out another black ball.
Since there are more black balls initially, the last ball will be black.
Q3. Difference between tmap & tjoin Types of connection Difference between truncate delete What is ETL What are triggers Type of join
tmap is used to transform data in Talend, tjoin is used to join data. There are different types of connections, truncate and delete are different ways to remove data from a table. ETL stands for Extract, Transform, Load. Triggers are database objects that are automatically executed in response to certain events. There are different types of joins.
tmap is used for data transformation in Talend
tjoin is used for joining data in Talend
Types of connections include database connect...read more
Q4. Design a website similar to bookmyshow.com for booking cinema tickets but it must be for a single location only which can have multiple theatres in it. In this he wanted me to design a basic rough GUI, relevant...
read moreDesign a website similar to bookmyshow.com for booking cinema tickets for a single location with multiple theatres.
Design a user-friendly GUI with options for advance booking, user login, user registration, movie rating, and saving card details.
Create relevant database tables to store information about movies, theatres, bookings, user details, and card details.
Link the GUI to the database to enable data flow and retrieval.
Implement features like advance booking, where users c...read more
Q5. Provided a string a character and a count, you have to print the string after the specified character has occurred count number of times. Ex: String: “This is demo string” Character: ‘i’ Count: 3 Output: “ng” H...
read moreThe program prints the substring after a specified character has occurred a certain number of times in a given string.
Iterate through the string to find the specified character.
Keep track of the count of occurrences of the character.
Once the count reaches the specified count, extract the substring after that position.
Handle corner cases such as when the character is not in the string or when it doesn't occur the specified number of times.
Q6. There are five glasses that are kept upside down.At a time you are bound to turn four glasses.Give minimum number of times in which you can turn back all the glasses so that now none among them are upside down
Minimum number of times to turn all glasses upside down when 4 can be turned at a time.
Turn over any four glasses, leaving one untouched.
Repeat the above step until only one glass is left upside down.
Finally, turn over the last glass to complete the task.
Minimum number of turns required is 3.
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Q7. Code: – Given the value of a starting position and an ending position, you have to reach from start to end in a linear way, and you can move either to position immediate right to current position or two step ri...
read morePrint all possible paths from start to end in a linear way, moving either one or two steps right.
Use dynamic programming to solve the problem
Create a 2D array to store the number of paths to each position
Start from the end position and work backwards
At each position, calculate the number of paths by summing the number of paths from the next two positions
Print all the paths by backtracking from the start position
Q8. How would you arrange the words in a string based on their order of occurence
The words in a string can be arranged based on their order of occurrence.
Split the string into an array of words
Create a dictionary to store the count of each word
Sort the array based on the count of each word
Join the sorted array back into a string
Application Developer Jobs
Q9. 3.Applications of python 4.What is pep8 5.What is the full form of CSS 6.Take input 1, input2 and input3 how to find input 3. 7. You and your 8 colleagues face issue how to help you resolving the issue. 8.Diffe...
read moreInterview questions for application developer including Python applications, PEP8, CSS, input handling, list vs tuples, and willingness to relocate.
Python is used for web development, data analysis, machine learning, and more
PEP8 is a style guide for Python code
CSS stands for Cascading Style Sheets and is used for styling web pages
To find input3, use input3 = input1 + input2
To resolve issues with colleagues, communicate and collaborate effectively
Lists and tuples are both use...read more
Q10. Write a code for inserting two numbers in a text file given n2>n1 and the next entry should not be overlapping like if first was 4,6 next can't be 5,7.the second n1 has to be greater than first n2
The code inserts two numbers in a text file, ensuring that the second number is greater than the first and there is no overlap between entries.
Read the existing entries from the text file
Check if the new numbers satisfy the conditions
If conditions are met, insert the new numbers into the file
Otherwise, display an error message
Q11. Types of search any how to use them is real life
Types of search include linear search, binary search, and hash table search. They are used in real life for finding information efficiently.
Linear search: sequentially checks each element in a list until a match is found.
Binary search: divides a sorted array in half to quickly find the target value.
Hash table search: uses a hash function to map keys to values for fast retrieval.
Real life example: Using linear search to find a specific book in a library.
Real life example: Usin...read more
Q12. Given a matrix.Write a code to print the transpose of the matrix
The code prints the transpose of a given matrix.
Iterate through each row and column of the matrix.
Swap the elements at the current row and column with the elements at the current column and row.
Print the transposed matrix.
Q13. Write a code to count the number of times '1' occurs from 1 to 999999
Code to count the number of times '1' occurs from 1 to 999999
Loop through all numbers from 1 to 999999
Convert each number to a string and count the number of '1's in it
Add the count to a running total
Return the total count
Q14. Write code to find the middle element of a linked list
Code to find the middle element of a linked list
Traverse the linked list with two pointers, one moving twice as fast as the other
When the fast pointer reaches the end, the slow pointer will be at the middle element
If the linked list has even number of elements, return the second middle element
Q15. 1.self introduction 2.Advantages of python
Python is a versatile and powerful programming language known for its simplicity and readability.
Python has a simple and easy-to-understand syntax, making it beginner-friendly.
It has a large standard library with built-in modules for various tasks, reducing the need for external dependencies.
Python supports multiple programming paradigms, including procedural, object-oriented, and functional programming.
It has excellent community support with a vast number of libraries and fr...read more
Q16. Puzzle: Gi1ven 4 coins, arrange then to make maximum numbers of triangle of the figure
Arrange 4 coins to make maximum number of triangles
Place 3 coins in a triangle formation and the fourth coin in the center to form 4 triangles
Place 2 coins on top of each other and the other 2 coins on either side to form 2 triangles
Place 2 coins in a line and the other 2 coins on either side to form 2 triangles
Q17. Puzzle: Given 10 coins, arrange them such that we get 4 different rows each containing 4 coins
Arrange 10 coins in 4 rows of 4 coins each.
Place 4 coins in a row and keep the remaining 6 aside.
Place 3 coins from the remaining 6 in the next row and keep the remaining 3 aside.
Place 2 coins from the remaining 3 in the third row and keep the remaining 1 aside.
Place the last coin in the fourth row along with the remaining 1 coin from step 3.
The final arrangement will have 4 rows with 4 coins each.
Q18. How will respond when you are the only one available on weekend , whenever there are client pings or user pings
I will prioritize urgent client or user pings and respond promptly to address their needs.
Prioritize urgent client or user pings over non-urgent ones
Respond promptly to address their needs
Communicate with the client or user to understand the issue and provide assistance
Document the issue and resolution for future reference
Q19. Do you have any idea about what is frontend and what is backend?
Frontend is the part of a website or application that users interact with, while backend is the part that handles the behind-the-scenes functionality.
Frontend is responsible for the user interface and user experience.
Backend is responsible for server-side logic, database operations, and other behind-the-scenes tasks.
Frontend technologies include HTML, CSS, and JavaScript.
Backend technologies include languages like Java, Python, and frameworks like Node.js.
Examples: Frontend -...read more
Q20. What are the indexes you used ? Diff between bitmap and btree index
Indexes used include bitmap and btree. Bitmap index is used for low cardinality columns, while btree index is used for high cardinality columns.
Bitmap index is efficient for low cardinality columns with few distinct values
Btree index is efficient for high cardinality columns with many distinct values
Bitmap index uses bitmaps to represent the presence of a value in a column
Btree index is a balanced tree structure that allows for fast searching and retrieval of data
Q21. What are job & components in Talend?
Talend is an ETL tool used for data integration. Jobs are workflows created in Talend to perform specific tasks. Components are pre-built functions used in jobs.
Jobs are created in Talend to perform specific tasks such as data extraction, transformation, and loading.
Components are pre-built functions that can be used in jobs to perform specific actions such as reading data from a file or database, transforming data, and writing data to a file or database.
Talend provides a wid...read more
Q22. Why the Talend is popular?
Talend is popular due to its open-source nature, ease of use, and ability to integrate with various systems.
Talend is open-source, making it accessible to a wide range of users.
It has a user-friendly interface, allowing developers to easily create and manage data integration workflows.
Talend can integrate with various systems, including cloud-based platforms like AWS and Azure.
It offers a wide range of connectors and components, making it versatile and adaptable to different ...read more
Q23. What are the differences between a procedure and a function?
Procedures do not return a value, while functions return a value.
Procedures are used to perform an action, while functions are used to calculate and return a value.
Functions must return a value, while procedures do not have a return statement.
Functions can be called from within SQL statements, while procedures cannot.
Example: Procedure - void PrintMessage(string message) { Console.WriteLine(message); }
Example: Function - int AddNumbers(int a, int b) { return a + b; }
Q24. What is managable unmanagable code. User and customerised control Triggers DI Global.csx Namespace Ado.net Generic and partial class Aspx,asmx,ascx Query optimisation using indexes Dataset and table
Manageable code is well-structured, organized, and easy to maintain, while unmanageable code is messy, hard to understand, and prone to errors.
Manageable code follows best practices and design patterns, making it easier to read and maintain.
Unmanageable code lacks structure, consistency, and documentation, making it difficult to work with.
Examples of manageable code include well-commented classes and methods, consistent naming conventions, and modular architecture.
Examples of...read more
Q25. Explain multitasking and multiprogramming
Multitasking is the ability of an operating system to run multiple tasks concurrently while multiprogramming is the ability to run multiple programs concurrently.
Multitasking allows multiple tasks to run concurrently on a single processor system.
Multiprogramming allows multiple programs to run concurrently on a single processor system.
Multitasking is achieved through time-sharing, where the processor switches between tasks at a very high speed.
Multiprogramming is achieved thr...read more
Q26. What is inner and outer join
Inner join returns only the matching records from both tables, while outer join returns all records from both tables.
Inner join combines rows from two tables based on a related column.
Outer join combines rows from two tables, including unmatched rows.
Inner join returns only the matching records from both tables.
Outer join returns all records from both tables, filling in NULL values for unmatched rows.
Example: Inner join of 'Customers' and 'Orders' tables will return only the ...read more
Q27. How is quality testing performed
Quality testing is performed to ensure that software meets the required standards and functions correctly.
Quality testing involves various techniques such as functional testing, performance testing, security testing, and usability testing.
Functional testing checks if the software meets the specified requirements.
Performance testing evaluates the software's speed, scalability, and stability under different conditions.
Security testing identifies vulnerabilities and ensures data...read more
Q28. Why string is immutable? Difference between arrays and Arraylist? Opps concepts? SQL queries
Answers to questions related to application development
String is immutable because it cannot be changed once created. Any modification creates a new object.
Arrays are fixed in size while ArrayLists can dynamically grow and shrink.
OOP concepts include encapsulation, inheritance, and polymorphism.
SQL queries are used to retrieve, insert, update, and delete data from a database.
Q29. Write a query to find 3rd highest salary from each department
Query to find 3rd highest salary from each department
Use window functions like ROW_NUMBER() to rank salaries within each department
Filter the results to only include rows where the rank is 3
Group by department to get the 3rd highest salary for each department
Q30. Add 20% discount code, Implement cashback
To add a 20% discount code and implement cashback in an application.
Create a discount code field in the application where users can enter the code to avail 20% off.
Calculate the discounted price by applying the 20% discount on the original price.
Implement a cashback feature where users receive a certain percentage of the purchase amount back as cashback.
Ensure that the cashback amount is credited to the user's account after the purchase is completed.
Q31. Design circular doubly linked list with all operations.
Circular doubly linked list is a data structure where each node has a reference to both the next and previous nodes, forming a circular loop.
Create a Node class with data, next, and prev pointers
Implement operations like insert, delete, search, and display
Ensure the last node's next pointer points to the first node and the first node's prev pointer points to the last node
Q32. Difference between spring created via literal and object.
Spring created via literal is created using curly braces with key-value pairs, while spring created via object is created using a constructor function.
Spring created via literal: var spring = { color: 'blue', length: 10 };
Spring created via object: function Spring(color, length) { this.color = color; this.length = length; }
Q33. Different types of searching and sorting algo discussion.
Searching and sorting algorithms are essential in programming for efficiently organizing and retrieving data.
Searching algorithms: linear search, binary search, depth-first search, breadth-first search
Sorting algorithms: bubble sort, selection sort, insertion sort, merge sort, quick sort
Examples: Searching for a specific item in a list, sorting a list of numbers in ascending order
Q34. write logic for program to remove duplicates in a string
Program to remove duplicates in a string
Create an empty array to store unique characters
Iterate through each character in the string
Check if the character is already in the array, if not add it
Q35. What is an SMPS?
SMPS stands for Switched-Mode Power Supply.
It is an electronic power supply that uses a switching regulator to convert electrical power efficiently.
It is commonly used in computers, TVs, and other electronic devices.
It is smaller and lighter than traditional linear power supplies.
It can operate at high frequencies, reducing the size of transformers and capacitors.
It is more energy-efficient than linear power supplies.
Examples include the Mean Well LRS-350-12 and the Delta Ele...read more
Q36. How to compare 2 files(file handling)
To compare 2 files in file handling, read both files line by line and compare each line.
Read both files line by line
Compare each line of the files
Handle cases where files have different number of lines
Use file handling functions like fopen, fgets, and fclose
Q37. How to deactivate trigger in proudction?
To deactivate a trigger in production, you can use the ALTER TRIGGER statement to disable the trigger.
Use the ALTER TRIGGER statement with the DISABLE option to deactivate the trigger.
Make sure to test the trigger deactivation in a non-production environment before applying it to production.
Document the trigger deactivation process for future reference and troubleshooting.
Q38. Comparison between Talend & pentaho.
Talend and Pentaho are both open-source data integration tools, but Talend is more user-friendly while Pentaho has better reporting capabilities.
Talend has a drag-and-drop interface and a large library of pre-built components, making it easier for non-technical users to create data integration workflows.
Pentaho has a more robust reporting engine and better visualization capabilities, making it a better choice for business intelligence and analytics.
Both tools support a wide r...read more
Q39. Oops concepts Difference between abstraction, encapsulation and interface
Abstraction focuses on hiding the implementation details, encapsulation bundles data and methods together, and interfaces define a contract for classes to implement.
Abstraction: Hides the implementation details and only shows the necessary features. Example: Car class with start() and stop() methods without showing the internal engine workings.
Encapsulation: Bundles data and methods together within a class, preventing direct access from outside. Example: Private variables wit...read more
Q40. Why python is used for data science
Python is used for data science due to its simplicity, readability, extensive libraries, and community support.
Python is easy to learn and read, making it accessible for beginners and experts alike
Python has a wide range of libraries like NumPy, Pandas, and Scikit-learn for data manipulation and analysis
Python has a strong community support with active forums and resources for data science enthusiasts
Python's versatility allows for integration with other tools and languages c...read more
Q41. Aws cloud services name a few
AWS offers a wide range of cloud services for various purposes.
Compute services: EC2, Lambda
Storage services: S3, EBS
Database services: RDS, DynamoDB
Networking services: VPC, Route 53
Security services: IAM, KMS
Analytics services: Redshift, EMR
AI/ML services: SageMaker, Rekognition
Q42. Tcode for badi and how to find badi
Tcode for BADI is SE18. To find a BADI, use transaction code SE18 and enter the BADI name or filter by application area.
Tcode for BADI is SE18
To find a BADI, use transaction code SE18
Enter the BADI name or filter by application area
Q43. what is lamda function in python?
Lambda function is an anonymous function in Python that can have any number of arguments, but can only have one expression.
Lambda functions are defined using the lambda keyword.
They are commonly used for small, one-time operations.
Lambda functions can be used as arguments to higher-order functions like map, filter, and reduce.
Example: add = lambda x, y: x + y
Q44. Encapsulation vs Polymorphism
Encapsulation focuses on hiding the internal state of an object and restricting access to it, while polymorphism allows objects of different classes to be treated as objects of a common superclass.
Encapsulation helps in achieving data hiding and abstraction by restricting access to certain components of an object.
Polymorphism allows objects of different classes to be treated as objects of a common superclass, enabling flexibility and extensibility in code.
Encapsulation is imp...read more
Q45. Advantages of Hashset over ArrayList?
HashSet provides constant time performance for basic operations like add, remove, contains, while ArrayList does not.
HashSet does not allow duplicate elements, while ArrayList allows duplicates.
HashSet does not maintain insertion order, while ArrayList maintains insertion order.
HashSet is faster for checking if an element exists (contains) compared to ArrayList.
Q46. Aws cloud pillars name a few
AWS cloud pillars are the foundation of AWS cloud computing services.
Security - ensuring data protection and privacy
Reliability - ensuring system availability and fault tolerance
Performance Efficiency - optimizing resource utilization and scalability
Cost Optimization - minimizing costs while maximizing benefits
Q47. Largest element in window size K
Find the largest element in a window of size K in an array.
Iterate through the array and maintain a deque to store the indices of elements in decreasing order.
Remove indices from the front of the deque that are outside the current window.
The front of the deque will always have the index of the largest element in the current window.
Q48. how you will create a branch
To create a branch, use version control system commands like git branch.
Use 'git branch' command to create a new branch in Git.
Specify the branch name after the command, e.g. 'git branch new-feature'.
To switch to the newly created branch, use 'git checkout new-feature'.
Q49. What language you haveused
I have used a variety of programming languages including Java, Python, C++, and JavaScript.
Java
Python
C++
JavaScript
Q50. OOP concepts in Java
OOP concepts in Java involve encapsulation, inheritance, polymorphism, and abstraction.
Encapsulation: Bundling data and methods that operate on the data into a single unit (class).
Inheritance: Allowing a class to inherit properties and behavior from another class.
Polymorphism: The ability for objects of different classes to respond to the same method call.
Abstraction: Hiding the implementation details and showing only the necessary features of an object.
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